This durable, sealed sound unit features stainless steel outside and diaphragm. Meets ABYC specification A-23 for boats up to 12 meters(39'). Fits existing hole patterns and are pre-wired. Max. amp draw: 6 amps. 112 dB rating. 3"L x 8"W x 1-3/4"H. 112 dB rating Stainless steel outside and diaphragm | Standard Mini Compact Dual Drop-In Horn